How do you signal your lover you want them from behind when NOT making love???

I realized that I often pat my lover on the rear and during the day, if I am planning on spending some time in there that night. Never realized it till she pointed it out. YES, we do "ask" in words, but more often then not, we don't. We "know".

Do you have any "signals", now that you think about it, to let your lover know you are interested in "going there" later?